Sound off! What are your favorite apps for traveling abroad?

It's summertime. Besides the living being easy, it's the perfect time for some much needed rest and relaxation. The next time you head out of town on vacation, you'll probably rely on your smartphone to help get you around. What are some important applications that make traveling and communicating easier? Which translator apps help you order food? Are you using VoIP to stay in touch with relatives? Do you rely on Airbnb to figure out where you're going to stay each night? How do you keep track of your flights? Head over to the Engadget forums and share your favorites!